i used to run into that problem a lot. i always had my alk between 8-9 and never worried about iodine.now that i keep my alk levels between 10-12 and usually above 11 and keeping an eye on iodine i no longer have issues with sps. quality test kits are also important, i love the red sea test kits and will never go back. if you buy the multi packs they become very affordable, not much more per test kit than the cheap ones.

oh and i also started using restore by brightwellm its a fatty acid etc. supplement.